Union Blue and Militia Gray: The Role of the New York State Militia in the Civil War - Appendix 2
The Army of Northeastern Virginia in the Bull Run Campaign on 21 July 1861
Army of Northeastern Virginia (BG Irvin McDowell)
First Division (Daniel Tyler)
1st Brigade (Erasmus Keyes)
2nd Maine
1st Connecticut
2nd Connecticut
3rd Connecticut
2nd Brigade (Robert Schenk)
2nd New York Vols.
1st Ohio
2nd Ohio
3rd Brigade (William T. Sherman)
13th New York Militia
69th New York Militia 7
9th New York Militia
2nd Wisconsin
4th Brigade (Israel Richardson)
1st Massachusetts
12th New York Vols.
2nd Michigan
3rd Michigan
Second Division (David Hunter)
1st Brigade (Andrew Porter)
8th New York Militia
14th New York Militia
27th New York Vols.
Battalion U.S. Infantry
Battalion U.S. Marines
Battalion U.S. Cavalry
2nd Brigade (Ambrose Burnside)
2nd New Hampshire
1st Rhode Island
2nd Rhode Island
71st N.Y. Militia
Third Division (Samuel Heintzelman)
1st Brigade (William Franklin)
5th Massachusetts
11th Massachusetts
1st Minnesota
2nd Brigade (Orlando Wilcox)
11th New York Vols.
38th New York Vols.
1st Michigan
4th Michigan
3rd Brigade (Oliver O. Howard)
3rd Maine
4m Maine
5tn Maine
Fifth Division (Dixon Miles)
1st Brigade (Louis Blenker)
8th New York Vols.
29th New York Vols.
39th New York Vols.
27th Pennsylvania
2nd Brigade (Thomas Davies)
16th New York Vols.
18th New York Vols.
31st New York Vols.
32nd New York Vols.
Note: The Fourth (Reserve) Division consisting of New Jersey militia and volunteer regiments did not accompany the army to Bull Run, but were advanced to Centreville after the battle to cover the withdrawal.
Source
U.S. War Department, The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Armies (Washington D.C.: U.S. Government Printing Office, 1880-1901), Series I, Vol. II, 227.